Non-linear rocking stiffness of embedded foundations in sand
Document identifier: oai:DiVA.org:ltu-75766
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10.1680/jgeot.17.P.201Keyword: Engineering and Technology,
Civil Engineering,
Geotechnical Engineering,
Teknik och teknologier,
Samhällsbyggnadsteknik,
Geoteknik,
Centrifuge modelling,
Dynamics,
Earthquakes,
Numerical modelling,
Soil/structure interaction,
Stiffness,
Soil MechanicsPublication year: 2019Abstract: The rocking response of embedded foundations in sand is studied, combining centrifuge modelling and numerical analysis. In total, 51 centrifuge model tests are conducted at ETH Zurich, varying the embedment ratio D/B and the factor of safety against vertical loading (bearing capacity), Fs. The experimental results are used to validate three-dimensional finite-element models, which are subsequently employed for a parametric study. The initial two phases of non-linear response are studied, namely quasi-elastic and non-linear response, while the third phase (plastic response) will be examined in a forthcoming publication. Regarding small-strain rocking stiffness, Kr (first phase), an extended formula is proposed, accounting for soil inhomogeneity along the embedded sidewalls. Kr is shown to decrease with Fs, due to initial soil yielding from vertical loading. The formula is further extended to account for the role of Fs, offering improved estimation of small-strain rocking stiffness. With respect to the non-linear response (second phase), it is shown that the degradation curves of rocking stiffness with rotation can become approximately dimensionless, if the rotation θ is normalised to a characteristic rotation, θs. The increase of D/B leads to a reduction of the normalised rotation θ/θs at which the non-linear response is initiated, due to the increasing participation of sidewall friction.
Authors
Damoun Taeseri
Institute for Geotechnical Engineering, ETH Zurich, Zurich, Switzerland
Other publications
>>
Jan Laue
Luleå tekniska universitet; Geoteknologi
Other publications
>>
Ioannis Anastasopoulos
Institute for Geotechnical Engineering, ETH Zurich, Zurich, Switzerland
Other publications
>>
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header:
identifier: oai:DiVA.org:ltu-75766
datestamp: 2021-04-19T13:07:02Z
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recordCreationDate: 2019-08-29
identifier:
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-75766
10.1680/jgeot.17.P.201
2-s2.0-85070779815
titleInfo:
@attributes:
lang: eng
title: Non-linear rocking stiffness of embedded foundations in sand
abstract: The rocking response of embedded foundations in sand is studied combining centrifuge modelling and numerical analysis. In total 51 centrifuge model tests are conducted at ETH Zurich varying the embedment ratio D/B and the factor of safety against vertical loading (bearing capacity) Fs. The experimental results are used to validate three-dimensional finite-element models which are subsequently employed for a parametric study. The initial two phases of non-linear response are studied namely quasi-elastic and non-linear response while the third phase (plastic response) will be examined in a forthcoming publication. Regarding small-strain rocking stiffness Kr (first phase) an extended formula is proposed accounting for soil inhomogeneity along the embedded sidewalls. Kr is shown to decrease with Fs due to initial soil yielding from vertical loading. The formula is further extended to account for the role of Fs offering improved estimation of small-strain rocking stiffness. With respect to the non-linear response (second phase) it is shown that the degradation curves of rocking stiffness with rotation can become approximately dimensionless if the rotation θ is normalised to a characteristic rotation θs. The increase of D/B leads to a reduction of the normalised rotation θ/θs at which the non-linear response is initiated due to the increasing participation of sidewall friction.
subject:
@attributes:
lang: eng
authority: uka.se
topic:
Engineering and Technology
Civil Engineering
Geotechnical Engineering
@attributes:
lang: swe
authority: uka.se
topic:
Teknik och teknologier
Samhällsbyggnadsteknik
Geoteknik
@attributes:
lang: eng
topic: centrifuge modelling
@attributes:
lang: eng
topic: dynamics
@attributes:
lang: eng
topic: earthquakes
@attributes:
lang: eng
topic: numerical modelling
@attributes:
lang: eng
topic: soil/structure interaction
@attributes:
lang: eng
topic: stiffness
@attributes:
lang: swe
authority: ltu
topic: Geoteknik
genre: Research subject
@attributes:
lang: eng
authority: ltu
topic: Soil Mechanics
genre: Research subject
language:
languageTerm: eng
genre:
publication/journal-article
ref
note:
Published
3
Validerad;2019;Nivå 2;2019-08-29 (johcin)
name:
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type: personal
namePart:
Taeseri
Damoun
role:
roleTerm: aut
affiliation: Institute for Geotechnical Engineering ETH Zurich Zurich Switzerland
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type: personal
authority: ltu
namePart:
Laue
Jan
role:
roleTerm: aut
affiliation:
Luleå tekniska universitet
Geoteknologi
nameIdentifier:
janlau
0000-0003-1935-1743
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type: personal
namePart:
Anastasopoulos
Ioannis
role:
roleTerm: aut
affiliation: Institute for Geotechnical Engineering ETH Zurich Zurich Switzerland
originInfo:
dateIssued: 2019
publisher: Institution of Civil Engineers (ICE)
relatedItem:
@attributes:
type: host
titleInfo:
title: Geotechnique
identifier:
0016-8505
1751-7656
part:
detail:
@attributes:
type: volume
number: 69
@attributes:
type: issue
number: 9
extent:
start: 767
end: 782
physicalDescription:
form: print
typeOfResource: text